The best way to combat this is to heighten public awareness and promote alternatives. IOW, do not buy products which do not specifically grant broad license to the purchaser.

A kind of You Didn't Build That campaign against DCMA -- You Don't Own That.

How big a deal would it be to switch from Nexus, Apple, Amazon to some comparable Chinese manufacturer?

There is a lot of protection -- at least circular illogic -- regarding the ability to extract a digital copy from optical media. Again, use the government's loophole (public libraries) to circumvent this. Instead of buying a DVD, borrow it from a library.

That's the answer -- boycott. Simply do not spend money on products with unfair licenses.